Wii remote rechargable batteries?

I picked up some rechargable batteries this weekend, and while they work in some things (Apple wireless keyboard, TV remote), they don't work in others (Apple wireless mighty mouse, Cable box remote, Wii remote). In most of the things they don't work in, the item specifically says 1.5V while these recharables (and most I've seen on the web at a quick glance) are 1.2V. Is that the reason for failure? Am I stuck with either using throw away batteries or blowing cash on the Wii-specific recharge packs whenever they come out?

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